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eb83e15862
Summary: This will force future modification to this file to be fully type checked. Reviewed By: fanzeyi Differential Revision: D28544422 fbshipit-source-id: 5ecc08a21e49535a3ed4ae9c33f219080365e609
61 lines
1.5 KiB
Python
61 lines
1.5 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2.
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# pyre-strict
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import asyncio
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import contextlib
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import io
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import pathlib
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import typing
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_BinaryIO = typing.Union[typing.IO[bytes], io.BufferedIOBase]
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@contextlib.contextmanager
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def forward_log_file(
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file_path: pathlib.Path, output_file: _BinaryIO
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) -> typing.Iterator["LogForwarder"]:
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with follow_log_file(file_path) as follower:
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yield LogForwarder(follower=follower, output_file=output_file)
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class LogForwarder:
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__follower: "LogFollower"
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__output_file: _BinaryIO
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def __init__(self, follower: "LogFollower", output_file: _BinaryIO) -> None:
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super().__init__()
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self.__follower = follower
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self.__output_file = output_file
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def poll(self) -> None:
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self.__output_file.write(self.__follower.poll())
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self.__output_file.flush()
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async def poll_forever_async(self) -> typing.NoReturn:
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while True:
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self.poll()
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await asyncio.sleep(0.1)
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@contextlib.contextmanager
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def follow_log_file(file_path: pathlib.Path) -> typing.Iterator["LogFollower"]:
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with open(file_path, "rb") as file:
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yield LogFollower(file)
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class LogFollower:
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__file: _BinaryIO
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def __init__(self, file: _BinaryIO) -> None:
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super().__init__()
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self.__file = file
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def poll(self) -> bytes:
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return self.__file.read()
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